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linux/drivers/input/misc/iqs626a.c
Jeff LaBundy e1f5e84820 Input: iqs626a - prohibit inlining of channel parsing functions 
Some automated builds report a stack frame size in excess of 2 kB for
iqs626_probe(); the culprit appears to be the call to iqs626_parse_prop().

To solve this problem, specify noinline_for_stack for all of the
iqs626_parse_*() helper functions which are called inside a for loop
within iqs626_parse_prop().

As a result, a build with '-Wframe-larger-than' as low as 512 is free of
any such warnings.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Jeff LaBundy <jeff@labundy.com>
Link: https://lore.kernel.org/r/20211129004104.453930-1-jeff@labundy.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2021-11-28 23:59:35 -08:00

1842 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* Azoteq IQS626A Capacitive Touch Controller
*
* Copyright (C) 2020 Jeff LaBundy <jeff@labundy.com>
*
* This driver registers up to 2 input devices: one representing capacitive or
* inductive keys as well as Hall-effect switches, and one for a trackpad that
* can express various gestures.
*/
#include <linux/bits.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/touchscreen.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#define IQS626_VER_INFO 0x00
#define IQS626_VER_INFO_PROD_NUM 0x51
#define IQS626_SYS_FLAGS 0x02
#define IQS626_SYS_FLAGS_SHOW_RESET BIT(15)
#define IQS626_SYS_FLAGS_IN_ATI BIT(12)
#define IQS626_SYS_FLAGS_PWR_MODE_MASK GENMASK(9, 8)
#define IQS626_SYS_FLAGS_PWR_MODE_SHIFT 8
#define IQS626_HALL_OUTPUT 0x23
#define IQS626_SYS_SETTINGS 0x80
#define IQS626_SYS_SETTINGS_CLK_DIV BIT(15)
#define IQS626_SYS_SETTINGS_ULP_AUTO BIT(14)
#define IQS626_SYS_SETTINGS_DIS_AUTO BIT(13)
#define IQS626_SYS_SETTINGS_PWR_MODE_MASK GENMASK(12, 11)
#define IQS626_SYS_SETTINGS_PWR_MODE_SHIFT 11
#define IQS626_SYS_SETTINGS_PWR_MODE_MAX 3
#define IQS626_SYS_SETTINGS_ULP_UPDATE_MASK GENMASK(10, 8)
#define IQS626_SYS_SETTINGS_ULP_UPDATE_SHIFT 8
#define IQS626_SYS_SETTINGS_ULP_UPDATE_MAX 7
#define IQS626_SYS_SETTINGS_EVENT_MODE BIT(5)
#define IQS626_SYS_SETTINGS_EVENT_MODE_LP BIT(4)
#define IQS626_SYS_SETTINGS_REDO_ATI BIT(2)
#define IQS626_SYS_SETTINGS_ACK_RESET BIT(0)
#define IQS626_MISC_A_ATI_BAND_DISABLE BIT(7)
#define IQS626_MISC_A_TPx_LTA_UPDATE_MASK GENMASK(6, 4)
#define IQS626_MISC_A_TPx_LTA_UPDATE_SHIFT 4
#define IQS626_MISC_A_TPx_LTA_UPDATE_MAX 7
#define IQS626_MISC_A_ATI_LP_ONLY BIT(3)
#define IQS626_MISC_A_GPIO3_SELECT_MASK GENMASK(2, 0)
#define IQS626_MISC_A_GPIO3_SELECT_MAX 7
#define IQS626_EVENT_MASK_SYS BIT(6)
#define IQS626_EVENT_MASK_GESTURE BIT(3)
#define IQS626_EVENT_MASK_DEEP BIT(2)
#define IQS626_EVENT_MASK_TOUCH BIT(1)
#define IQS626_EVENT_MASK_PROX BIT(0)
#define IQS626_RATE_NP_MS_MAX 255
#define IQS626_RATE_LP_MS_MAX 255
#define IQS626_RATE_ULP_MS_MAX 4080
#define IQS626_TIMEOUT_PWR_MS_MAX 130560
#define IQS626_TIMEOUT_LTA_MS_MAX 130560
#define IQS626_MISC_B_RESEED_UI_SEL_MASK GENMASK(7, 6)
#define IQS626_MISC_B_RESEED_UI_SEL_SHIFT 6
#define IQS626_MISC_B_RESEED_UI_SEL_MAX 3
#define IQS626_MISC_B_THRESH_EXTEND BIT(5)
#define IQS626_MISC_B_TRACKING_UI_ENABLE BIT(4)
#define IQS626_MISC_B_TPx_SWIPE BIT(3)
#define IQS626_MISC_B_RESEED_OFFSET BIT(2)
#define IQS626_MISC_B_FILT_STR_TPx GENMASK(1, 0)
#define IQS626_THRESH_SWIPE_MAX 255
#define IQS626_TIMEOUT_TAP_MS_MAX 4080
#define IQS626_TIMEOUT_SWIPE_MS_MAX 4080
#define IQS626_CHx_ENG_0_MEAS_CAP_SIZE BIT(7)
#define IQS626_CHx_ENG_0_RX_TERM_VSS BIT(5)
#define IQS626_CHx_ENG_0_LINEARIZE BIT(4)
#define IQS626_CHx_ENG_0_DUAL_DIR BIT(3)
#define IQS626_CHx_ENG_0_FILT_DISABLE BIT(2)
#define IQS626_CHx_ENG_0_ATI_MODE_MASK GENMASK(1, 0)
#define IQS626_CHx_ENG_0_ATI_MODE_MAX 3
#define IQS626_CHx_ENG_1_CCT_HIGH_1 BIT(7)
#define IQS626_CHx_ENG_1_CCT_HIGH_0 BIT(6)
#define IQS626_CHx_ENG_1_PROJ_BIAS_MASK GENMASK(5, 4)
#define IQS626_CHx_ENG_1_PROJ_BIAS_SHIFT 4
#define IQS626_CHx_ENG_1_PROJ_BIAS_MAX 3
#define IQS626_CHx_ENG_1_CCT_ENABLE BIT(3)
#define IQS626_CHx_ENG_1_SENSE_FREQ_MASK GENMASK(2, 1)
#define IQS626_CHx_ENG_1_SENSE_FREQ_SHIFT 1
#define IQS626_CHx_ENG_1_SENSE_FREQ_MAX 3
#define IQS626_CHx_ENG_1_ATI_BAND_TIGHTEN BIT(0)
#define IQS626_CHx_ENG_2_LOCAL_CAP_MASK GENMASK(7, 6)
#define IQS626_CHx_ENG_2_LOCAL_CAP_SHIFT 6
#define IQS626_CHx_ENG_2_LOCAL_CAP_MAX 3
#define IQS626_CHx_ENG_2_LOCAL_CAP_ENABLE BIT(5)
#define IQS626_CHx_ENG_2_SENSE_MODE_MASK GENMASK(3, 0)
#define IQS626_CHx_ENG_2_SENSE_MODE_MAX 15
#define IQS626_CHx_ENG_3_TX_FREQ_MASK GENMASK(5, 4)
#define IQS626_CHx_ENG_3_TX_FREQ_SHIFT 4
#define IQS626_CHx_ENG_3_TX_FREQ_MAX 3
#define IQS626_CHx_ENG_3_INV_LOGIC BIT(0)
#define IQS626_CHx_ENG_4_RX_TERM_VREG BIT(6)
#define IQS626_CHx_ENG_4_CCT_LOW_1 BIT(5)
#define IQS626_CHx_ENG_4_CCT_LOW_0 BIT(4)
#define IQS626_CHx_ENG_4_COMP_DISABLE BIT(1)
#define IQS626_CHx_ENG_4_STATIC_ENABLE BIT(0)
#define IQS626_TPx_ATI_BASE_MIN 45
#define IQS626_TPx_ATI_BASE_MAX 300
#define IQS626_CHx_ATI_BASE_MASK GENMASK(7, 6)
#define IQS626_CHx_ATI_BASE_75 0x00
#define IQS626_CHx_ATI_BASE_100 0x40
#define IQS626_CHx_ATI_BASE_150 0x80
#define IQS626_CHx_ATI_BASE_200 0xC0
#define IQS626_CHx_ATI_TARGET_MASK GENMASK(5, 0)
#define IQS626_CHx_ATI_TARGET_MAX 2016
#define IQS626_CHx_THRESH_MAX 255
#define IQS626_CHx_HYST_DEEP_MASK GENMASK(7, 4)
#define IQS626_CHx_HYST_DEEP_SHIFT 4
#define IQS626_CHx_HYST_TOUCH_MASK GENMASK(3, 0)
#define IQS626_CHx_HYST_MAX 15
#define IQS626_FILT_STR_NP_TPx_MASK GENMASK(7, 6)
#define IQS626_FILT_STR_NP_TPx_SHIFT 6
#define IQS626_FILT_STR_LP_TPx_MASK GENMASK(5, 4)
#define IQS626_FILT_STR_LP_TPx_SHIFT 4
#define IQS626_FILT_STR_NP_CNT_MASK GENMASK(7, 6)
#define IQS626_FILT_STR_NP_CNT_SHIFT 6
#define IQS626_FILT_STR_LP_CNT_MASK GENMASK(5, 4)
#define IQS626_FILT_STR_LP_CNT_SHIFT 4
#define IQS626_FILT_STR_NP_LTA_MASK GENMASK(3, 2)
#define IQS626_FILT_STR_NP_LTA_SHIFT 2
#define IQS626_FILT_STR_LP_LTA_MASK GENMASK(1, 0)
#define IQS626_FILT_STR_MAX 3
#define IQS626_ULP_PROJ_ENABLE BIT(4)
#define IQS626_GEN_WEIGHT_MAX 255
#define IQS626_MAX_REG 0xFF
#define IQS626_NUM_CH_TP_3 9
#define IQS626_NUM_CH_TP_2 6
#define IQS626_NUM_CH_GEN 3
#define IQS626_NUM_CRx_TX 8
#define IQS626_PWR_MODE_POLL_SLEEP_US 50000
#define IQS626_PWR_MODE_POLL_TIMEOUT_US 500000
#define iqs626_irq_wait() usleep_range(350, 400)
enum iqs626_ch_id {
IQS626_CH_ULP_0,
IQS626_CH_TP_2,
IQS626_CH_TP_3,
IQS626_CH_GEN_0,
IQS626_CH_GEN_1,
IQS626_CH_GEN_2,
IQS626_CH_HALL,
};
enum iqs626_rx_inactive {
IQS626_RX_INACTIVE_VSS,
IQS626_RX_INACTIVE_FLOAT,
IQS626_RX_INACTIVE_VREG,
};
enum iqs626_st_offs {
IQS626_ST_OFFS_PROX,
IQS626_ST_OFFS_DIR,
IQS626_ST_OFFS_TOUCH,
IQS626_ST_OFFS_DEEP,
};
enum iqs626_th_offs {
IQS626_TH_OFFS_PROX,
IQS626_TH_OFFS_TOUCH,
IQS626_TH_OFFS_DEEP,
};
enum iqs626_event_id {
IQS626_EVENT_PROX_DN,
IQS626_EVENT_PROX_UP,
IQS626_EVENT_TOUCH_DN,
IQS626_EVENT_TOUCH_UP,
IQS626_EVENT_DEEP_DN,
IQS626_EVENT_DEEP_UP,
};
enum iqs626_gesture_id {
IQS626_GESTURE_FLICK_X_POS,
IQS626_GESTURE_FLICK_X_NEG,
IQS626_GESTURE_FLICK_Y_POS,
IQS626_GESTURE_FLICK_Y_NEG,
IQS626_GESTURE_TAP,
IQS626_GESTURE_HOLD,
IQS626_NUM_GESTURES,
};
struct iqs626_event_desc {
const char *name;
enum iqs626_st_offs st_offs;
enum iqs626_th_offs th_offs;
bool dir_up;
u8 mask;
};
static const struct iqs626_event_desc iqs626_events[] = {
[IQS626_EVENT_PROX_DN] = {
.name = "event-prox",
.st_offs = IQS626_ST_OFFS_PROX,
.th_offs = IQS626_TH_OFFS_PROX,
.mask = IQS626_EVENT_MASK_PROX,
},
[IQS626_EVENT_PROX_UP] = {
.name = "event-prox-alt",
.st_offs = IQS626_ST_OFFS_PROX,
.th_offs = IQS626_TH_OFFS_PROX,
.dir_up = true,
.mask = IQS626_EVENT_MASK_PROX,
},
[IQS626_EVENT_TOUCH_DN] = {
.name = "event-touch",
.st_offs = IQS626_ST_OFFS_TOUCH,
.th_offs = IQS626_TH_OFFS_TOUCH,
.mask = IQS626_EVENT_MASK_TOUCH,
},
[IQS626_EVENT_TOUCH_UP] = {
.name = "event-touch-alt",
.st_offs = IQS626_ST_OFFS_TOUCH,
.th_offs = IQS626_TH_OFFS_TOUCH,
.dir_up = true,
.mask = IQS626_EVENT_MASK_TOUCH,
},
[IQS626_EVENT_DEEP_DN] = {
.name = "event-deep",
.st_offs = IQS626_ST_OFFS_DEEP,
.th_offs = IQS626_TH_OFFS_DEEP,
.mask = IQS626_EVENT_MASK_DEEP,
},
[IQS626_EVENT_DEEP_UP] = {
.name = "event-deep-alt",
.st_offs = IQS626_ST_OFFS_DEEP,
.th_offs = IQS626_TH_OFFS_DEEP,
.dir_up = true,
.mask = IQS626_EVENT_MASK_DEEP,
},
};
struct iqs626_ver_info {
u8 prod_num;
u8 sw_num;
u8 hw_num;
u8 padding;
} __packed;
struct iqs626_flags {
__be16 system;
u8 gesture;
u8 padding_a;
u8 states[4];
u8 ref_active;
u8 padding_b;
u8 comp_min;
u8 comp_max;
u8 trackpad_x;
u8 trackpad_y;
} __packed;
struct iqs626_ch_reg_ulp {
u8 thresh[2];
u8 hyst;
u8 filter;
u8 engine[2];
u8 ati_target;
u8 padding;
__be16 ati_comp;
u8 rx_enable;
u8 tx_enable;
} __packed;
struct iqs626_ch_reg_tp {
u8 thresh;
u8 ati_base;
__be16 ati_comp;
} __packed;
struct iqs626_tp_grp_reg {
u8 hyst;
u8 ati_target;
u8 engine[2];
struct iqs626_ch_reg_tp ch_reg_tp[IQS626_NUM_CH_TP_3];
} __packed;
struct iqs626_ch_reg_gen {
u8 thresh[3];
u8 padding;
u8 hyst;
u8 ati_target;
__be16 ati_comp;
u8 engine[5];
u8 filter;
u8 rx_enable;
u8 tx_enable;
u8 assoc_select;
u8 assoc_weight;
} __packed;
struct iqs626_ch_reg_hall {
u8 engine;
u8 thresh;
u8 hyst;
u8 ati_target;
__be16 ati_comp;
} __packed;
struct iqs626_sys_reg {
__be16 general;
u8 misc_a;
u8 event_mask;
u8 active;
u8 reseed;
u8 rate_np;
u8 rate_lp;
u8 rate_ulp;
u8 timeout_pwr;
u8 timeout_rdy;
u8 timeout_lta;
u8 misc_b;
u8 thresh_swipe;
u8 timeout_tap;
u8 timeout_swipe;
u8 redo_ati;
u8 padding;
struct iqs626_ch_reg_ulp ch_reg_ulp;
struct iqs626_tp_grp_reg tp_grp_reg;
struct iqs626_ch_reg_gen ch_reg_gen[IQS626_NUM_CH_GEN];
struct iqs626_ch_reg_hall ch_reg_hall;
} __packed;
struct iqs626_channel_desc {
const char *name;
int num_ch;
u8 active;
bool events[ARRAY_SIZE(iqs626_events)];
};
static const struct iqs626_channel_desc iqs626_channels[] = {
[IQS626_CH_ULP_0] = {
.name = "ulp-0",
.num_ch = 1,
.active = BIT(0),
.events = {
[IQS626_EVENT_PROX_DN] = true,
[IQS626_EVENT_PROX_UP] = true,
[IQS626_EVENT_TOUCH_DN] = true,
[IQS626_EVENT_TOUCH_UP] = true,
},
},
[IQS626_CH_TP_2] = {
.name = "trackpad-3x2",
.num_ch = IQS626_NUM_CH_TP_2,
.active = BIT(1),
.events = {
[IQS626_EVENT_TOUCH_DN] = true,
},
},
[IQS626_CH_TP_3] = {
.name = "trackpad-3x3",
.num_ch = IQS626_NUM_CH_TP_3,
.active = BIT(2) | BIT(1),
.events = {
[IQS626_EVENT_TOUCH_DN] = true,
},
},
[IQS626_CH_GEN_0] = {
.name = "generic-0",
.num_ch = 1,
.active = BIT(4),
.events = {
[IQS626_EVENT_PROX_DN] = true,
[IQS626_EVENT_PROX_UP] = true,
[IQS626_EVENT_TOUCH_DN] = true,
[IQS626_EVENT_TOUCH_UP] = true,
[IQS626_EVENT_DEEP_DN] = true,
[IQS626_EVENT_DEEP_UP] = true,
},
},
[IQS626_CH_GEN_1] = {
.name = "generic-1",
.num_ch = 1,
.active = BIT(5),
.events = {
[IQS626_EVENT_PROX_DN] = true,
[IQS626_EVENT_PROX_UP] = true,
[IQS626_EVENT_TOUCH_DN] = true,
[IQS626_EVENT_TOUCH_UP] = true,
[IQS626_EVENT_DEEP_DN] = true,
[IQS626_EVENT_DEEP_UP] = true,
},
},
[IQS626_CH_GEN_2] = {
.name = "generic-2",
.num_ch = 1,
.active = BIT(6),
.events = {
[IQS626_EVENT_PROX_DN] = true,
[IQS626_EVENT_PROX_UP] = true,
[IQS626_EVENT_TOUCH_DN] = true,
[IQS626_EVENT_TOUCH_UP] = true,
[IQS626_EVENT_DEEP_DN] = true,
[IQS626_EVENT_DEEP_UP] = true,
},
},
[IQS626_CH_HALL] = {
.name = "hall",
.num_ch = 1,
.active = BIT(7),
.events = {
[IQS626_EVENT_TOUCH_DN] = true,
[IQS626_EVENT_TOUCH_UP] = true,
},
},
};
struct iqs626_private {
struct i2c_client *client;
struct regmap *regmap;
struct iqs626_sys_reg sys_reg;
struct completion ati_done;
struct input_dev *keypad;
struct input_dev *trackpad;
struct touchscreen_properties prop;
unsigned int kp_type[ARRAY_SIZE(iqs626_channels)]
[ARRAY_SIZE(iqs626_events)];
unsigned int kp_code[ARRAY_SIZE(iqs626_channels)]
[ARRAY_SIZE(iqs626_events)];
unsigned int tp_code[IQS626_NUM_GESTURES];
unsigned int suspend_mode;
};
static noinline_for_stack int
iqs626_parse_events(struct iqs626_private *iqs626,
const struct fwnode_handle *ch_node,
enum iqs626_ch_id ch_id)
{
struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
struct i2c_client *client = iqs626->client;
const struct fwnode_handle *ev_node;
const char *ev_name;
u8 *thresh, *hyst;
unsigned int thresh_tp[IQS626_NUM_CH_TP_3];
unsigned int val;
int num_ch = iqs626_channels[ch_id].num_ch;
int error, i, j;
switch (ch_id) {
case IQS626_CH_ULP_0:
thresh = sys_reg->ch_reg_ulp.thresh;
hyst = &sys_reg->ch_reg_ulp.hyst;
break;
case IQS626_CH_TP_2:
case IQS626_CH_TP_3:
thresh = &sys_reg->tp_grp_reg.ch_reg_tp[0].thresh;
hyst = &sys_reg->tp_grp_reg.hyst;
break;
case IQS626_CH_GEN_0:
case IQS626_CH_GEN_1:
case IQS626_CH_GEN_2:
i = ch_id - IQS626_CH_GEN_0;
thresh = sys_reg->ch_reg_gen[i].thresh;
hyst = &sys_reg->ch_reg_gen[i].hyst;
break;
case IQS626_CH_HALL:
thresh = &sys_reg->ch_reg_hall.thresh;
hyst = &sys_reg->ch_reg_hall.hyst;
break;
default:
return -EINVAL;
}
for (i = 0; i < ARRAY_SIZE(iqs626_events); i++) {
if (!iqs626_channels[ch_id].events[i])
continue;
if (ch_id == IQS626_CH_TP_2 || ch_id == IQS626_CH_TP_3) {
/*
* Trackpad touch events are simply described under the
* trackpad child node.
*/
ev_node = ch_node;
} else {
ev_name = iqs626_events[i].name;
ev_node = fwnode_get_named_child_node(ch_node, ev_name);
if (!ev_node)
continue;
if (!fwnode_property_read_u32(ev_node, "linux,code",
&val)) {
iqs626->kp_code[ch_id][i] = val;
if (fwnode_property_read_u32(ev_node,
"linux,input-type",
&val)) {
if (ch_id == IQS626_CH_HALL)
val = EV_SW;
else
val = EV_KEY;
}
if (val != EV_KEY && val != EV_SW) {
dev_err(&client->dev,
"Invalid input type: %u\n",
val);
return -EINVAL;
}
iqs626->kp_type[ch_id][i] = val;
sys_reg->event_mask &= ~iqs626_events[i].mask;
}
}
if (!fwnode_property_read_u32(ev_node, "azoteq,hyst", &val)) {
if (val > IQS626_CHx_HYST_MAX) {
dev_err(&client->dev,
"Invalid %s channel hysteresis: %u\n",
fwnode_get_name(ch_node), val);
return -EINVAL;
}
if (i == IQS626_EVENT_DEEP_DN ||
i == IQS626_EVENT_DEEP_UP) {
*hyst &= ~IQS626_CHx_HYST_DEEP_MASK;
*hyst |= (val << IQS626_CHx_HYST_DEEP_SHIFT);
} else if (i == IQS626_EVENT_TOUCH_DN ||
i == IQS626_EVENT_TOUCH_UP) {
*hyst &= ~IQS626_CHx_HYST_TOUCH_MASK;
*hyst |= val;
}
}
if (ch_id != IQS626_CH_TP_2 && ch_id != IQS626_CH_TP_3 &&
!fwnode_property_read_u32(ev_node, "azoteq,thresh", &val)) {
if (val > IQS626_CHx_THRESH_MAX) {
dev_err(&client->dev,
"Invalid %s channel threshold: %u\n",
fwnode_get_name(ch_node), val);
return -EINVAL;
}
if (ch_id == IQS626_CH_HALL)
*thresh = val;
else
*(thresh + iqs626_events[i].th_offs) = val;
continue;
}
if (!fwnode_property_present(ev_node, "azoteq,thresh"))
continue;
error = fwnode_property_read_u32_array(ev_node, "azoteq,thresh",
thresh_tp, num_ch);
if (error) {
dev_err(&client->dev,
"Failed to read %s channel thresholds: %d\n",
fwnode_get_name(ch_node), error);
return error;
}
for (j = 0; j < num_ch; j++) {
if (thresh_tp[j] > IQS626_CHx_THRESH_MAX) {
dev_err(&client->dev,
"Invalid %s channel threshold: %u\n",
fwnode_get_name(ch_node), thresh_tp[j]);
return -EINVAL;
}
sys_reg->tp_grp_reg.ch_reg_tp[j].thresh = thresh_tp[j];
}
}
return 0;
}
static noinline_for_stack int
iqs626_parse_ati_target(struct iqs626_private *iqs626,
const struct fwnode_handle *ch_node,
enum iqs626_ch_id ch_id)
{
struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
struct i2c_client *client = iqs626->client;
unsigned int ati_base[IQS626_NUM_CH_TP_3];
unsigned int val;
u8 *ati_target;
int num_ch = iqs626_channels[ch_id].num_ch;
int error, i;
switch (ch_id) {
case IQS626_CH_ULP_0:
ati_target = &sys_reg->ch_reg_ulp.ati_target;
break;
case IQS626_CH_TP_2:
case IQS626_CH_TP_3:
ati_target = &sys_reg->tp_grp_reg.ati_target;
break;
case IQS626_CH_GEN_0:
case IQS626_CH_GEN_1:
case IQS626_CH_GEN_2:
i = ch_id - IQS626_CH_GEN_0;
ati_target = &sys_reg->ch_reg_gen[i].ati_target;
break;
case IQS626_CH_HALL:
ati_target = &sys_reg->ch_reg_hall.ati_target;
break;
default:
return -EINVAL;
}
if (!fwnode_property_read_u32(ch_node, "azoteq,ati-target", &val)) {
if (val > IQS626_CHx_ATI_TARGET_MAX) {
dev_err(&client->dev,
"Invalid %s channel ATI target: %u\n",
fwnode_get_name(ch_node), val);
return -EINVAL;
}
*ati_target &= ~IQS626_CHx_ATI_TARGET_MASK;
*ati_target |= (val / 32);
}
if (ch_id != IQS626_CH_TP_2 && ch_id != IQS626_CH_TP_3 &&
!fwnode_property_read_u32(ch_node, "azoteq,ati-base", &val)) {
switch (val) {
case 75:
val = IQS626_CHx_ATI_BASE_75;
break;
case 100:
val = IQS626_CHx_ATI_BASE_100;
break;
case 150:
val = IQS626_CHx_ATI_BASE_150;
break;
case 200:
val = IQS626_CHx_ATI_BASE_200;
break;
default:
dev_err(&client->dev,
"Invalid %s channel ATI base: %u\n",
fwnode_get_name(ch_node), val);
return -EINVAL;
}
*ati_target &= ~IQS626_CHx_ATI_BASE_MASK;
*ati_target |= val;
return 0;
}
if (!fwnode_property_present(ch_node, "azoteq,ati-base"))
return 0;
error = fwnode_property_read_u32_array(ch_node, "azoteq,ati-base",
ati_base, num_ch);
if (error) {
dev_err(&client->dev,
"Failed to read %s channel ATI bases: %d\n",
fwnode_get_name(ch_node), error);
return error;
}
for (i = 0; i < num_ch; i++) {
if (ati_base[i] < IQS626_TPx_ATI_BASE_MIN ||
ati_base[i] > IQS626_TPx_ATI_BASE_MAX) {
dev_err(&client->dev,
"Invalid %s channel ATI base: %u\n",
fwnode_get_name(ch_node), ati_base[i]);
return -EINVAL;
}
ati_base[i] -= IQS626_TPx_ATI_BASE_MIN;
sys_reg->tp_grp_reg.ch_reg_tp[i].ati_base = ati_base[i];
}
return 0;
}
static int iqs626_parse_pins(struct iqs626_private *iqs626,
const struct fwnode_handle *ch_node,
const char *propname, u8 *enable)
{
struct i2c_client *client = iqs626->client;
unsigned int val[IQS626_NUM_CRx_TX];
int error, count, i;
if (!fwnode_property_present(ch_node, propname))
return 0;
count = fwnode_property_count_u32(ch_node, propname);
if (count > IQS626_NUM_CRx_TX) {
dev_err(&client->dev,
"Too many %s channel CRX/TX pins present\n",
fwnode_get_name(ch_node));
return -EINVAL;
} else if (count < 0) {
dev_err(&client->dev,
"Failed to count %s channel CRX/TX pins: %d\n",
fwnode_get_name(ch_node), count);
return count;
}
error = fwnode_property_read_u32_array(ch_node, propname, val, count);
if (error) {
dev_err(&client->dev,
"Failed to read %s channel CRX/TX pins: %d\n",
fwnode_get_name(ch_node), error);
return error;
}
*enable = 0;
for (i = 0; i < count; i++) {
if (val[i] >= IQS626_NUM_CRx_TX) {
dev_err(&client->dev,
"Invalid %s channel CRX/TX pin: %u\n",
fwnode_get_name(ch_node), val[i]);
return -EINVAL;
}
*enable |= BIT(val[i]);
}
return 0;
}
static int iqs626_parse_trackpad(struct iqs626_private *iqs626,
const struct fwnode_handle *ch_node)
{
struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
struct i2c_client *client = iqs626->client;
u8 *hyst = &sys_reg->tp_grp_reg.hyst;
unsigned int val;
int error, count;
if (!fwnode_property_read_u32(ch_node, "azoteq,lta-update", &val)) {
if (val > IQS626_MISC_A_TPx_LTA_UPDATE_MAX) {
dev_err(&client->dev,
"Invalid %s channel update rate: %u\n",
fwnode_get_name(ch_node), val);
return -EINVAL;
}
sys_reg->misc_a &= ~IQS626_MISC_A_TPx_LTA_UPDATE_MASK;
sys_reg->misc_a |= (val << IQS626_MISC_A_TPx_LTA_UPDATE_SHIFT);
}
if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-trackpad",
&val)) {
if (val > IQS626_FILT_STR_MAX) {
dev_err(&client->dev,
"Invalid %s channel filter strength: %u\n",
fwnode_get_name(ch_node), val);
return -EINVAL;
}
sys_reg->misc_b &= ~IQS626_MISC_B_FILT_STR_TPx;
sys_reg->misc_b |= val;
}
if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-np-cnt",
&val)) {
if (val > IQS626_FILT_STR_MAX) {
dev_err(&client->dev,
"Invalid %s channel filter strength: %u\n",
fwnode_get_name(ch_node), val);
return -EINVAL;
}
*hyst &= ~IQS626_FILT_STR_NP_TPx_MASK;
*hyst |= (val << IQS626_FILT_STR_NP_TPx_SHIFT);
}
if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-lp-cnt",
&val)) {
if (val > IQS626_FILT_STR_MAX) {
dev_err(&client->dev,
"Invalid %s channel filter strength: %u\n",
fwnode_get_name(ch_node), val);
return -EINVAL;
}
*hyst &= ~IQS626_FILT_STR_LP_TPx_MASK;
*hyst |= (val << IQS626_FILT_STR_LP_TPx_SHIFT);
}
if (!fwnode_property_present(ch_node, "linux,keycodes"))
return 0;
count = fwnode_property_count_u32(ch_node, "linux,keycodes");
if (count > IQS626_NUM_GESTURES) {
dev_err(&client->dev, "Too many keycodes present\n");
return -EINVAL;
} else if (count < 0) {
dev_err(&client->dev, "Failed to count keycodes: %d\n", count);
return count;
}
error = fwnode_property_read_u32_array(ch_node, "linux,keycodes",
iqs626->tp_code, count);
if (error) {
dev_err(&client->dev, "Failed to read keycodes: %d\n", error);
return error;
}
sys_reg->misc_b &= ~IQS626_MISC_B_TPx_SWIPE;
if (fwnode_property_present(ch_node, "azoteq,gesture-swipe"))
sys_reg->misc_b |= IQS626_MISC_B_TPx_SWIPE;
if (!fwnode_property_read_u32(ch_node, "azoteq,timeout-tap-ms",
&val)) {
if (val > IQS626_TIMEOUT_TAP_MS_MAX) {
dev_err(&client->dev,
"Invalid %s channel timeout: %u\n",
fwnode_get_name(ch_node), val);
return -EINVAL;
}
sys_reg->timeout_tap = val / 16;
}
if (!fwnode_property_read_u32(ch_node, "azoteq,timeout-swipe-ms",
&val)) {
if (val > IQS626_TIMEOUT_SWIPE_MS_MAX) {
dev_err(&client->dev,
"Invalid %s channel timeout: %u\n",
fwnode_get_name(ch_node), val);
return -EINVAL;
}
sys_reg->timeout_swipe = val / 16;
}
if (!fwnode_property_read_u32(ch_node, "azoteq,thresh-swipe",
&val)) {
if (val > IQS626_THRESH_SWIPE_MAX) {
dev_err(&client->dev,
"Invalid %s channel threshold: %u\n",
fwnode_get_name(ch_node), val);
return -EINVAL;
}
sys_reg->thresh_swipe = val;
}
sys_reg->event_mask &= ~IQS626_EVENT_MASK_GESTURE;
return 0;
}
static noinline_for_stack int
iqs626_parse_channel(struct iqs626_private *iqs626,
const struct fwnode_handle *ch_node,
enum iqs626_ch_id ch_id)
{
struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
struct i2c_client *client = iqs626->client;
u8 *engine, *filter, *rx_enable, *tx_enable;
u8 *assoc_select, *assoc_weight;
unsigned int val;
int error, i;
switch (ch_id) {
case IQS626_CH_ULP_0:
engine = sys_reg->ch_reg_ulp.engine;
break;
case IQS626_CH_TP_2:
case IQS626_CH_TP_3:
engine = sys_reg->tp_grp_reg.engine;
break;
case IQS626_CH_GEN_0:
case IQS626_CH_GEN_1:
case IQS626_CH_GEN_2:
i = ch_id - IQS626_CH_GEN_0;
engine = sys_reg->ch_reg_gen[i].engine;
break;
case IQS626_CH_HALL:
engine = &sys_reg->ch_reg_hall.engine;
break;
default:
return -EINVAL;
}
*engine |= IQS626_CHx_ENG_0_MEAS_CAP_SIZE;
if (fwnode_property_present(ch_node, "azoteq,meas-cap-decrease"))
*engine &= ~IQS626_CHx_ENG_0_MEAS_CAP_SIZE;
*engine |= IQS626_CHx_ENG_0_RX_TERM_VSS;
if (!fwnode_property_read_u32(ch_node, "azoteq,rx-inactive", &val)) {
switch (val) {
case IQS626_RX_INACTIVE_VSS:
break;
case IQS626_RX_INACTIVE_FLOAT:
*engine &= ~IQS626_CHx_ENG_0_RX_TERM_VSS;
if (ch_id == IQS626_CH_GEN_0 ||
ch_id == IQS626_CH_GEN_1 ||
ch_id == IQS626_CH_GEN_2)
*(engine + 4) &= ~IQS626_CHx_ENG_4_RX_TERM_VREG;
break;
case IQS626_RX_INACTIVE_VREG:
if (ch_id == IQS626_CH_GEN_0 ||
ch_id == IQS626_CH_GEN_1 ||
ch_id == IQS626_CH_GEN_2) {
*engine &= ~IQS626_CHx_ENG_0_RX_TERM_VSS;
*(engine + 4) |= IQS626_CHx_ENG_4_RX_TERM_VREG;
break;
}
fallthrough;
default:
dev_err(&client->dev,
"Invalid %s channel CRX pin termination: %u\n",
fwnode_get_name(ch_node), val);
return -EINVAL;
}
}
*engine &= ~IQS626_CHx_ENG_0_LINEARIZE;
if (fwnode_property_present(ch_node, "azoteq,linearize"))
*engine |= IQS626_CHx_ENG_0_LINEARIZE;
*engine &= ~IQS626_CHx_ENG_0_DUAL_DIR;
if (fwnode_property_present(ch_node, "azoteq,dual-direction"))
*engine |= IQS626_CHx_ENG_0_DUAL_DIR;
*engine &= ~IQS626_CHx_ENG_0_FILT_DISABLE;
if (fwnode_property_present(ch_node, "azoteq,filt-disable"))
*engine |= IQS626_CHx_ENG_0_FILT_DISABLE;
if (!fwnode_property_read_u32(ch_node, "azoteq,ati-mode", &val)) {
if (val > IQS626_CHx_ENG_0_ATI_MODE_MAX) {
dev_err(&client->dev,
"Invalid %s channel ATI mode: %u\n",
fwnode_get_name(ch_node), val);
return -EINVAL;
}
*engine &= ~IQS626_CHx_ENG_0_ATI_MODE_MASK;
*engine |= val;
}
if (ch_id == IQS626_CH_HALL)
return 0;
*(engine + 1) &= ~IQS626_CHx_ENG_1_CCT_ENABLE;
if (!fwnode_property_read_u32(ch_node, "azoteq,cct-increase",
&val) && val) {
unsigned int orig_val = val--;
/*
* In the case of the generic channels, the charge cycle time
* field doubles in size and straddles two separate registers.
*/
if (ch_id == IQS626_CH_GEN_0 ||
ch_id == IQS626_CH_GEN_1 ||
ch_id == IQS626_CH_GEN_2) {
*(engine + 4) &= ~IQS626_CHx_ENG_4_CCT_LOW_1;
if (val & BIT(1))
*(engine + 4) |= IQS626_CHx_ENG_4_CCT_LOW_1;
*(engine + 4) &= ~IQS626_CHx_ENG_4_CCT_LOW_0;
if (val & BIT(0))
*(engine + 4) |= IQS626_CHx_ENG_4_CCT_LOW_0;
val >>= 2;
}
if (val & ~GENMASK(1, 0)) {
dev_err(&client->dev,
"Invalid %s channel charge cycle time: %u\n",
fwnode_get_name(ch_node), orig_val);
return -EINVAL;
}
*(engine + 1) &= ~IQS626_CHx_ENG_1_CCT_HIGH_1;
if (val & BIT(1))
*(engine + 1) |= IQS626_CHx_ENG_1_CCT_HIGH_1;
*(engine + 1) &= ~IQS626_CHx_ENG_1_CCT_HIGH_0;
if (val & BIT(0))
*(engine + 1) |= IQS626_CHx_ENG_1_CCT_HIGH_0;
*(engine + 1) |= IQS626_CHx_ENG_1_CCT_ENABLE;
}
if (!fwnode_property_read_u32(ch_node, "azoteq,proj-bias", &val)) {
if (val > IQS626_CHx_ENG_1_PROJ_BIAS_MAX) {
dev_err(&client->dev,
"Invalid %s channel bias current: %u\n",
fwnode_get_name(ch_node), val);
return -EINVAL;
}
*(engine + 1) &= ~IQS626_CHx_ENG_1_PROJ_BIAS_MASK;
*(engine + 1) |= (val << IQS626_CHx_ENG_1_PROJ_BIAS_SHIFT);
}
if (!fwnode_property_read_u32(ch_node, "azoteq,sense-freq", &val)) {
if (val > IQS626_CHx_ENG_1_SENSE_FREQ_MAX) {
dev_err(&client->dev,
"Invalid %s channel sensing frequency: %u\n",
fwnode_get_name(ch_node), val);
return -EINVAL;
}
*(engine + 1) &= ~IQS626_CHx_ENG_1_SENSE_FREQ_MASK;
*(engine + 1) |= (val << IQS626_CHx_ENG_1_SENSE_FREQ_SHIFT);
}
*(engine + 1) &= ~IQS626_CHx_ENG_1_ATI_BAND_TIGHTEN;
if (fwnode_property_present(ch_node, "azoteq,ati-band-tighten"))
*(engine + 1) |= IQS626_CHx_ENG_1_ATI_BAND_TIGHTEN;
if (ch_id == IQS626_CH_TP_2 || ch_id == IQS626_CH_TP_3)
return iqs626_parse_trackpad(iqs626, ch_node);
if (ch_id == IQS626_CH_ULP_0) {
sys_reg->ch_reg_ulp.hyst &= ~IQS626_ULP_PROJ_ENABLE;
if (fwnode_property_present(ch_node, "azoteq,proj-enable"))
sys_reg->ch_reg_ulp.hyst |= IQS626_ULP_PROJ_ENABLE;
filter = &sys_reg->ch_reg_ulp.filter;
rx_enable = &sys_reg->ch_reg_ulp.rx_enable;
tx_enable = &sys_reg->ch_reg_ulp.tx_enable;
} else {
i = ch_id - IQS626_CH_GEN_0;
filter = &sys_reg->ch_reg_gen[i].filter;
rx_enable = &sys_reg->ch_reg_gen[i].rx_enable;
tx_enable = &sys_reg->ch_reg_gen[i].tx_enable;
}
if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-np-cnt",
&val)) {
if (val > IQS626_FILT_STR_MAX) {
dev_err(&client->dev,
"Invalid %s channel filter strength: %u\n",
fwnode_get_name(ch_node), val);
return -EINVAL;
}
*filter &= ~IQS626_FILT_STR_NP_CNT_MASK;
*filter |= (val << IQS626_FILT_STR_NP_CNT_SHIFT);
}
if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-lp-cnt",
&val)) {
if (val > IQS626_FILT_STR_MAX) {
dev_err(&client->dev,
"Invalid %s channel filter strength: %u\n",
fwnode_get_name(ch_node), val);
return -EINVAL;
}
*filter &= ~IQS626_FILT_STR_LP_CNT_MASK;
*filter |= (val << IQS626_FILT_STR_LP_CNT_SHIFT);
}
if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-np-lta",
&val)) {
if (val > IQS626_FILT_STR_MAX) {
dev_err(&client->dev,
"Invalid %s channel filter strength: %u\n",
fwnode_get_name(ch_node), val);
return -EINVAL;
}
*filter &= ~IQS626_FILT_STR_NP_LTA_MASK;
*filter |= (val << IQS626_FILT_STR_NP_LTA_SHIFT);
}
if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-lp-lta",
&val)) {
if (val > IQS626_FILT_STR_MAX) {
dev_err(&client->dev,
"Invalid %s channel filter strength: %u\n",
fwnode_get_name(ch_node), val);
return -EINVAL;
}
*filter &= ~IQS626_FILT_STR_LP_LTA_MASK;
*filter |= val;
}
error = iqs626_parse_pins(iqs626, ch_node, "azoteq,rx-enable",
rx_enable);
if (error)
return error;
error = iqs626_parse_pins(iqs626, ch_node, "azoteq,tx-enable",
tx_enable);
if (error)
return error;
if (ch_id == IQS626_CH_ULP_0)
return 0;
*(engine + 2) &= ~IQS626_CHx_ENG_2_LOCAL_CAP_ENABLE;
if (!fwnode_property_read_u32(ch_node, "azoteq,local-cap-size",
&val) && val) {
unsigned int orig_val = val--;
if (val > IQS626_CHx_ENG_2_LOCAL_CAP_MAX) {
dev_err(&client->dev,
"Invalid %s channel local cap. size: %u\n",
fwnode_get_name(ch_node), orig_val);
return -EINVAL;
}
*(engine + 2) &= ~IQS626_CHx_ENG_2_LOCAL_CAP_MASK;
*(engine + 2) |= (val << IQS626_CHx_ENG_2_LOCAL_CAP_SHIFT);
*(engine + 2) |= IQS626_CHx_ENG_2_LOCAL_CAP_ENABLE;
}
if (!fwnode_property_read_u32(ch_node, "azoteq,sense-mode", &val)) {
if (val > IQS626_CHx_ENG_2_SENSE_MODE_MAX) {
dev_err(&client->dev,
"Invalid %s channel sensing mode: %u\n",
fwnode_get_name(ch_node), val);
return -EINVAL;
}
*(engine + 2) &= ~IQS626_CHx_ENG_2_SENSE_MODE_MASK;
*(engine + 2) |= val;
}
if (!fwnode_property_read_u32(ch_node, "azoteq,tx-freq", &val)) {
if (val > IQS626_CHx_ENG_3_TX_FREQ_MAX) {
dev_err(&client->dev,
"Invalid %s channel excitation frequency: %u\n",
fwnode_get_name(ch_node), val);
return -EINVAL;
}
*(engine + 3) &= ~IQS626_CHx_ENG_3_TX_FREQ_MASK;
*(engine + 3) |= (val << IQS626_CHx_ENG_3_TX_FREQ_SHIFT);
}
*(engine + 3) &= ~IQS626_CHx_ENG_3_INV_LOGIC;
if (fwnode_property_present(ch_node, "azoteq,invert-enable"))
*(engine + 3) |= IQS626_CHx_ENG_3_INV_LOGIC;
*(engine + 4) &= ~IQS626_CHx_ENG_4_COMP_DISABLE;
if (fwnode_property_present(ch_node, "azoteq,comp-disable"))
*(engine + 4) |= IQS626_CHx_ENG_4_COMP_DISABLE;
*(engine + 4) &= ~IQS626_CHx_ENG_4_STATIC_ENABLE;
if (fwnode_property_present(ch_node, "azoteq,static-enable"))
*(engine + 4) |= IQS626_CHx_ENG_4_STATIC_ENABLE;
i = ch_id - IQS626_CH_GEN_0;
assoc_select = &sys_reg->ch_reg_gen[i].assoc_select;
assoc_weight = &sys_reg->ch_reg_gen[i].assoc_weight;
*assoc_select = 0;
if (!fwnode_property_present(ch_node, "azoteq,assoc-select"))
return 0;
for (i = 0; i < ARRAY_SIZE(iqs626_channels); i++) {
if (fwnode_property_match_string(ch_node, "azoteq,assoc-select",
iqs626_channels[i].name) < 0)
continue;
*assoc_select |= iqs626_channels[i].active;
}
if (fwnode_property_read_u32(ch_node, "azoteq,assoc-weight", &val))
return 0;
if (val > IQS626_GEN_WEIGHT_MAX) {
dev_err(&client->dev,
"Invalid %s channel associated weight: %u\n",
fwnode_get_name(ch_node), val);
return -EINVAL;
}
*assoc_weight = val;
return 0;
}
static int iqs626_parse_prop(struct iqs626_private *iqs626)
{
struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
struct i2c_client *client = iqs626->client;
struct fwnode_handle *ch_node;
unsigned int val;
int error, i;
u16 general;
if (!device_property_read_u32(&client->dev, "azoteq,suspend-mode",
&val)) {
if (val > IQS626_SYS_SETTINGS_PWR_MODE_MAX) {
dev_err(&client->dev, "Invalid suspend mode: %u\n",
val);
return -EINVAL;
}
iqs626->suspend_mode = val;
}
error = regmap_raw_read(iqs626->regmap, IQS626_SYS_SETTINGS, sys_reg,
sizeof(*sys_reg));
if (error)
return error;
general = be16_to_cpu(sys_reg->general);
general &= IQS626_SYS_SETTINGS_ULP_UPDATE_MASK;
if (device_property_present(&client->dev, "azoteq,clk-div"))
general |= IQS626_SYS_SETTINGS_CLK_DIV;
if (device_property_present(&client->dev, "azoteq,ulp-enable"))
general |= IQS626_SYS_SETTINGS_ULP_AUTO;
if (!device_property_read_u32(&client->dev, "azoteq,ulp-update",
&val)) {
if (val > IQS626_SYS_SETTINGS_ULP_UPDATE_MAX) {
dev_err(&client->dev, "Invalid update rate: %u\n", val);
return -EINVAL;
}
general &= ~IQS626_SYS_SETTINGS_ULP_UPDATE_MASK;
general |= (val << IQS626_SYS_SETTINGS_ULP_UPDATE_SHIFT);
}
sys_reg->misc_a &= ~IQS626_MISC_A_ATI_BAND_DISABLE;
if (device_property_present(&client->dev, "azoteq,ati-band-disable"))
sys_reg->misc_a |= IQS626_MISC_A_ATI_BAND_DISABLE;
sys_reg->misc_a &= ~IQS626_MISC_A_ATI_LP_ONLY;
if (device_property_present(&client->dev, "azoteq,ati-lp-only"))
sys_reg->misc_a |= IQS626_MISC_A_ATI_LP_ONLY;
if (!device_property_read_u32(&client->dev, "azoteq,gpio3-select",
&val)) {
if (val > IQS626_MISC_A_GPIO3_SELECT_MAX) {
dev_err(&client->dev, "Invalid GPIO3 selection: %u\n",
val);
return -EINVAL;
}
sys_reg->misc_a &= ~IQS626_MISC_A_GPIO3_SELECT_MASK;
sys_reg->misc_a |= val;
}
if (!device_property_read_u32(&client->dev, "azoteq,reseed-select",
&val)) {
if (val > IQS626_MISC_B_RESEED_UI_SEL_MAX) {
dev_err(&client->dev, "Invalid reseed selection: %u\n",
val);
return -EINVAL;
}
sys_reg->misc_b &= ~IQS626_MISC_B_RESEED_UI_SEL_MASK;
sys_reg->misc_b |= (val << IQS626_MISC_B_RESEED_UI_SEL_SHIFT);
}
sys_reg->misc_b &= ~IQS626_MISC_B_THRESH_EXTEND;
if (device_property_present(&client->dev, "azoteq,thresh-extend"))
sys_reg->misc_b |= IQS626_MISC_B_THRESH_EXTEND;
sys_reg->misc_b &= ~IQS626_MISC_B_TRACKING_UI_ENABLE;
if (device_property_present(&client->dev, "azoteq,tracking-enable"))
sys_reg->misc_b |= IQS626_MISC_B_TRACKING_UI_ENABLE;
sys_reg->misc_b &= ~IQS626_MISC_B_RESEED_OFFSET;
if (device_property_present(&client->dev, "azoteq,reseed-offset"))
sys_reg->misc_b |= IQS626_MISC_B_RESEED_OFFSET;
if (!device_property_read_u32(&client->dev, "azoteq,rate-np-ms",
&val)) {
if (val > IQS626_RATE_NP_MS_MAX) {
dev_err(&client->dev, "Invalid report rate: %u\n", val);
return -EINVAL;
}
sys_reg->rate_np = val;
}
if (!device_property_read_u32(&client->dev, "azoteq,rate-lp-ms",
&val)) {
if (val > IQS626_RATE_LP_MS_MAX) {
dev_err(&client->dev, "Invalid report rate: %u\n", val);
return -EINVAL;
}
sys_reg->rate_lp = val;
}
if (!device_property_read_u32(&client->dev, "azoteq,rate-ulp-ms",
&val)) {
if (val > IQS626_RATE_ULP_MS_MAX) {
dev_err(&client->dev, "Invalid report rate: %u\n", val);
return -EINVAL;
}
sys_reg->rate_ulp = val / 16;
}
if (!device_property_read_u32(&client->dev, "azoteq,timeout-pwr-ms",
&val)) {
if (val > IQS626_TIMEOUT_PWR_MS_MAX) {
dev_err(&client->dev, "Invalid timeout: %u\n", val);
return -EINVAL;
}
sys_reg->timeout_pwr = val / 512;
}
if (!device_property_read_u32(&client->dev, "azoteq,timeout-lta-ms",
&val)) {
if (val > IQS626_TIMEOUT_LTA_MS_MAX) {
dev_err(&client->dev, "Invalid timeout: %u\n", val);
return -EINVAL;
}
sys_reg->timeout_lta = val / 512;
}
sys_reg->event_mask = ~((u8)IQS626_EVENT_MASK_SYS);
sys_reg->redo_ati = 0;
sys_reg->reseed = 0;
sys_reg->active = 0;
for (i = 0; i < ARRAY_SIZE(iqs626_channels); i++) {
ch_node = device_get_named_child_node(&client->dev,
iqs626_channels[i].name);
if (!ch_node)
continue;
error = iqs626_parse_channel(iqs626, ch_node, i);
if (error)
return error;
error = iqs626_parse_ati_target(iqs626, ch_node, i);
if (error)
return error;
error = iqs626_parse_events(iqs626, ch_node, i);
if (error)
return error;
if (!fwnode_property_present(ch_node, "azoteq,ati-exclude"))
sys_reg->redo_ati |= iqs626_channels[i].active;
if (!fwnode_property_present(ch_node, "azoteq,reseed-disable"))
sys_reg->reseed |= iqs626_channels[i].active;
sys_reg->active |= iqs626_channels[i].active;
}
general |= IQS626_SYS_SETTINGS_EVENT_MODE;
/*
* Enable streaming during normal-power mode if the trackpad is used to
* report raw coordinates instead of gestures. In that case, the device
* returns to event mode during low-power mode.
*/
if (sys_reg->active & iqs626_channels[IQS626_CH_TP_2].active &&
sys_reg->event_mask & IQS626_EVENT_MASK_GESTURE)
general |= IQS626_SYS_SETTINGS_EVENT_MODE_LP;
general |= IQS626_SYS_SETTINGS_REDO_ATI;
general |= IQS626_SYS_SETTINGS_ACK_RESET;
sys_reg->general = cpu_to_be16(general);
error = regmap_raw_write(iqs626->regmap, IQS626_SYS_SETTINGS,
&iqs626->sys_reg, sizeof(iqs626->sys_reg));
if (error)
return error;
iqs626_irq_wait();
return 0;
}
static int iqs626_input_init(struct iqs626_private *iqs626)
{
struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
struct i2c_client *client = iqs626->client;
int error, i, j;
iqs626->keypad = devm_input_allocate_device(&client->dev);
if (!iqs626->keypad)
return -ENOMEM;
iqs626->keypad->keycodemax = ARRAY_SIZE(iqs626->kp_code);
iqs626->keypad->keycode = iqs626->kp_code;
iqs626->keypad->keycodesize = sizeof(**iqs626->kp_code);
iqs626->keypad->name = "iqs626a_keypad";
iqs626->keypad->id.bustype = BUS_I2C;
for (i = 0; i < ARRAY_SIZE(iqs626_channels); i++) {
if (!(sys_reg->active & iqs626_channels[i].active))
continue;
for (j = 0; j < ARRAY_SIZE(iqs626_events); j++) {
if (!iqs626->kp_type[i][j])
continue;
input_set_capability(iqs626->keypad,
iqs626->kp_type[i][j],
iqs626->kp_code[i][j]);
}
}
if (!(sys_reg->active & iqs626_channels[IQS626_CH_TP_2].active))
return 0;
iqs626->trackpad = devm_input_allocate_device(&client->dev);
if (!iqs626->trackpad)
return -ENOMEM;
iqs626->trackpad->keycodemax = ARRAY_SIZE(iqs626->tp_code);
iqs626->trackpad->keycode = iqs626->tp_code;
iqs626->trackpad->keycodesize = sizeof(*iqs626->tp_code);
iqs626->trackpad->name = "iqs626a_trackpad";
iqs626->trackpad->id.bustype = BUS_I2C;
/*
* Present the trackpad as a traditional pointing device if no gestures
* have been mapped to a keycode.
*/
if (sys_reg->event_mask & IQS626_EVENT_MASK_GESTURE) {
u8 tp_mask = iqs626_channels[IQS626_CH_TP_3].active;
input_set_capability(iqs626->trackpad, EV_KEY, BTN_TOUCH);
input_set_abs_params(iqs626->trackpad, ABS_Y, 0, 255, 0, 0);
if ((sys_reg->active & tp_mask) == tp_mask)
input_set_abs_params(iqs626->trackpad,
ABS_X, 0, 255, 0, 0);
else
input_set_abs_params(iqs626->trackpad,
ABS_X, 0, 128, 0, 0);
touchscreen_parse_properties(iqs626->trackpad, false,
&iqs626->prop);
} else {
for (i = 0; i < IQS626_NUM_GESTURES; i++)
if (iqs626->tp_code[i] != KEY_RESERVED)
input_set_capability(iqs626->trackpad, EV_KEY,
iqs626->tp_code[i]);
}
error = input_register_device(iqs626->trackpad);
if (error)
dev_err(&client->dev, "Failed to register trackpad: %d\n",
error);
return error;
}
static int iqs626_report(struct iqs626_private *iqs626)
{
struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
struct i2c_client *client = iqs626->client;
struct iqs626_flags flags;
__le16 hall_output;
int error, i, j;
u8 state;
u8 *dir_mask = &flags.states[IQS626_ST_OFFS_DIR];
error = regmap_raw_read(iqs626->regmap, IQS626_SYS_FLAGS, &flags,
sizeof(flags));
if (error) {
dev_err(&client->dev, "Failed to read device status: %d\n",
error);
return error;
}
/*
* The device resets itself if its own watchdog bites, which can happen
* in the event of an I2C communication error. In this case, the device
* asserts a SHOW_RESET interrupt and all registers must be restored.
*/
if (be16_to_cpu(flags.system) & IQS626_SYS_FLAGS_SHOW_RESET) {
dev_err(&client->dev, "Unexpected device reset\n");
error = regmap_raw_write(iqs626->regmap, IQS626_SYS_SETTINGS,
sys_reg, sizeof(*sys_reg));
if (error)
dev_err(&client->dev,
"Failed to re-initialize device: %d\n", error);
return error;
}
if (be16_to_cpu(flags.system) & IQS626_SYS_FLAGS_IN_ATI)
return 0;
/*
* Unlike the ULP or generic channels, the Hall channel does not have a
* direction flag. Instead, the direction (i.e. magnet polarity) can be
* derived based on the sign of the 2's complement differential output.
*/
if (sys_reg->active & iqs626_channels[IQS626_CH_HALL].active) {
error = regmap_raw_read(iqs626->regmap, IQS626_HALL_OUTPUT,
&hall_output, sizeof(hall_output));
if (error) {
dev_err(&client->dev,
"Failed to read Hall output: %d\n", error);
return error;
}
*dir_mask &= ~iqs626_channels[IQS626_CH_HALL].active;
if (le16_to_cpu(hall_output) < 0x8000)
*dir_mask |= iqs626_channels[IQS626_CH_HALL].active;
}
for (i = 0; i < ARRAY_SIZE(iqs626_channels); i++) {
if (!(sys_reg->active & iqs626_channels[i].active))
continue;
for (j = 0; j < ARRAY_SIZE(iqs626_events); j++) {
if (!iqs626->kp_type[i][j])
continue;
state = flags.states[iqs626_events[j].st_offs];
state &= iqs626_events[j].dir_up ? *dir_mask
: ~(*dir_mask);
state &= iqs626_channels[i].active;
input_event(iqs626->keypad, iqs626->kp_type[i][j],
iqs626->kp_code[i][j], !!state);
}
}
input_sync(iqs626->keypad);
/*
* The following completion signals that ATI has finished, any initial
* switch states have been reported and the keypad can be registered.
*/
complete_all(&iqs626->ati_done);
if (!(sys_reg->active & iqs626_channels[IQS626_CH_TP_2].active))
return 0;
if (sys_reg->event_mask & IQS626_EVENT_MASK_GESTURE) {
state = flags.states[IQS626_ST_OFFS_TOUCH];
state &= iqs626_channels[IQS626_CH_TP_2].active;
input_report_key(iqs626->trackpad, BTN_TOUCH, state);
if (state)
touchscreen_report_pos(iqs626->trackpad, &iqs626->prop,
flags.trackpad_x,
flags.trackpad_y, false);
} else {
for (i = 0; i < IQS626_NUM_GESTURES; i++)
input_report_key(iqs626->trackpad, iqs626->tp_code[i],
flags.gesture & BIT(i));
if (flags.gesture & GENMASK(IQS626_GESTURE_TAP, 0)) {
input_sync(iqs626->trackpad);
/*
* Momentary gestures are followed by a complementary
* release cycle so as to emulate a full keystroke.
*/
for (i = 0; i < IQS626_GESTURE_HOLD; i++)
input_report_key(iqs626->trackpad,
iqs626->tp_code[i], 0);
}
}
input_sync(iqs626->trackpad);
return 0;
}
static irqreturn_t iqs626_irq(int irq, void *context)
{
struct iqs626_private *iqs626 = context;
if (iqs626_report(iqs626))
return IRQ_NONE;
/*
* The device does not deassert its interrupt (RDY) pin until shortly
* after receiving an I2C stop condition; the following delay ensures
* the interrupt handler does not return before this time.
*/
iqs626_irq_wait();
return IRQ_HANDLED;
}
static const struct regmap_config iqs626_regmap_config = {
.reg_bits = 8,
.val_bits = 16,
.max_register = IQS626_MAX_REG,
};
static int iqs626_probe(struct i2c_client *client)
{
struct iqs626_ver_info ver_info;
struct iqs626_private *iqs626;
int error;
iqs626 = devm_kzalloc(&client->dev, sizeof(*iqs626), GFP_KERNEL);
if (!iqs626)
return -ENOMEM;
i2c_set_clientdata(client, iqs626);
iqs626->client = client;
iqs626->regmap = devm_regmap_init_i2c(client, &iqs626_regmap_config);
if (IS_ERR(iqs626->regmap)) {
error = PTR_ERR(iqs626->regmap);
dev_err(&client->dev, "Failed to initialize register map: %d\n",
error);
return error;
}
init_completion(&iqs626->ati_done);
error = regmap_raw_read(iqs626->regmap, IQS626_VER_INFO, &ver_info,
sizeof(ver_info));
if (error)
return error;
if (ver_info.prod_num != IQS626_VER_INFO_PROD_NUM) {
dev_err(&client->dev, "Unrecognized product number: 0x%02X\n",
ver_info.prod_num);
return -EINVAL;
}
error = iqs626_parse_prop(iqs626);
if (error)
return error;
error = iqs626_input_init(iqs626);
if (error)
return error;
error = devm_request_threaded_irq(&client->dev, client->irq,
NULL, iqs626_irq, IRQF_ONESHOT,
client->name, iqs626);
if (error) {
dev_err(&client->dev, "Failed to request IRQ: %d\n", error);
return error;
}
if (!wait_for_completion_timeout(&iqs626->ati_done,
msecs_to_jiffies(2000))) {
dev_err(&client->dev, "Failed to complete ATI\n");
return -ETIMEDOUT;
}
/*
* The keypad may include one or more switches and is not registered
* until ATI is complete and the initial switch states are read.
*/
error = input_register_device(iqs626->keypad);
if (error)
dev_err(&client->dev, "Failed to register keypad: %d\n", error);
return error;
}
static int __maybe_unused iqs626_suspend(struct device *dev)
{
struct iqs626_private *iqs626 = dev_get_drvdata(dev);
struct i2c_client *client = iqs626->client;
unsigned int val;
int error;
if (!iqs626->suspend_mode)
return 0;
disable_irq(client->irq);
/*
* Automatic power mode switching must be disabled before the device is
* forced into any particular power mode. In this case, the device will
* transition into normal-power mode.
*/
error = regmap_update_bits(iqs626->regmap, IQS626_SYS_SETTINGS,
IQS626_SYS_SETTINGS_DIS_AUTO, ~0);
if (error)
goto err_irq;
/*
* The following check ensures the device has completed its transition
* into normal-power mode before a manual mode switch is performed.
*/
error = regmap_read_poll_timeout(iqs626->regmap, IQS626_SYS_FLAGS, val,
!(val & IQS626_SYS_FLAGS_PWR_MODE_MASK),
IQS626_PWR_MODE_POLL_SLEEP_US,
IQS626_PWR_MODE_POLL_TIMEOUT_US);
if (error)
goto err_irq;
error = regmap_update_bits(iqs626->regmap, IQS626_SYS_SETTINGS,
IQS626_SYS_SETTINGS_PWR_MODE_MASK,
iqs626->suspend_mode <<
IQS626_SYS_SETTINGS_PWR_MODE_SHIFT);
if (error)
goto err_irq;
/*
* This last check ensures the device has completed its transition into
* the desired power mode to prevent any spurious interrupts from being
* triggered after iqs626_suspend has already returned.
*/
error = regmap_read_poll_timeout(iqs626->regmap, IQS626_SYS_FLAGS, val,
(val & IQS626_SYS_FLAGS_PWR_MODE_MASK)
== (iqs626->suspend_mode <<
IQS626_SYS_FLAGS_PWR_MODE_SHIFT),
IQS626_PWR_MODE_POLL_SLEEP_US,
IQS626_PWR_MODE_POLL_TIMEOUT_US);
err_irq:
iqs626_irq_wait();
enable_irq(client->irq);
return error;
}
static int __maybe_unused iqs626_resume(struct device *dev)
{
struct iqs626_private *iqs626 = dev_get_drvdata(dev);
struct i2c_client *client = iqs626->client;
unsigned int val;
int error;
if (!iqs626->suspend_mode)
return 0;
disable_irq(client->irq);
error = regmap_update_bits(iqs626->regmap, IQS626_SYS_SETTINGS,
IQS626_SYS_SETTINGS_PWR_MODE_MASK, 0);
if (error)
goto err_irq;
/*
* This check ensures the device has returned to normal-power mode
* before automatic power mode switching is re-enabled.
*/
error = regmap_read_poll_timeout(iqs626->regmap, IQS626_SYS_FLAGS, val,
!(val & IQS626_SYS_FLAGS_PWR_MODE_MASK),
IQS626_PWR_MODE_POLL_SLEEP_US,
IQS626_PWR_MODE_POLL_TIMEOUT_US);
if (error)
goto err_irq;
error = regmap_update_bits(iqs626->regmap, IQS626_SYS_SETTINGS,
IQS626_SYS_SETTINGS_DIS_AUTO, 0);
if (error)
goto err_irq;
/*
* This step reports any events that may have been "swallowed" as a
* result of polling PWR_MODE (which automatically acknowledges any
* pending interrupts).
*/
error = iqs626_report(iqs626);
err_irq:
iqs626_irq_wait();
enable_irq(client->irq);
return error;
}
static SIMPLE_DEV_PM_OPS(iqs626_pm, iqs626_suspend, iqs626_resume);
static const struct of_device_id iqs626_of_match[] = {
{ .compatible = "azoteq,iqs626a" },
{ }
};
MODULE_DEVICE_TABLE(of, iqs626_of_match);
static struct i2c_driver iqs626_i2c_driver = {
.driver = {
.name = "iqs626a",
.of_match_table = iqs626_of_match,
.pm = &iqs626_pm,
},
.probe_new = iqs626_probe,
};
module_i2c_driver(iqs626_i2c_driver);
MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
MODULE_DESCRIPTION("Azoteq IQS626A Capacitive Touch Controller");
MODULE_LICENSE("GPL");
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